fix: use absolute URL for OG image src

Relative path wasn't resolving correctly. Use the full absolute URL
to ensure the OG image works in all contexts.

https://claude.ai/code/session_011oBs69H1Y31avULLt2FL4W

Author: claude

docs/src/config.ts

@@ -6,7 +6,7 @@ export const SITE = {
 
 export const OPEN_GRAPH = {
   image: {
-    src: '/og-image.png',
+    src: 'https://www.media-chrome.org/og-image.png',
     alt: 'html tag on a green background',
   },
   twitter: 'MuxHQ',